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pjb-page.el
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pjb-page.el
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;;;; -*- mode:emacs-lisp;coding:utf-8 -*-
;;;;****************************************************************************
;;;;FILE: pjb-page.el
;;;;LANGUAGE: emacs lisp
;;;;SYSTEM: POSIX
;;;;USER-INTERFACE: NONE
;;;;DESCRIPTION
;;;;
;;;; View a buffer page by page.
;;;;
;;;;AUTHORS
;;;; <PJB> Pascal Bourguignon <pjb@informatimago.com>
;;;;MODIFICATIONS
;;;; 2005-06-01 <PJB> Created.
;;;;BUGS
;;;;LEGAL
;;;; GPL
;;;;
;;;; Copyright Pascal Bourguignon 2005 - 2011
;;;;
;;;; This program is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU General Public License
;;;; as published by the Free Software Foundation; either version
;;;; 2 of the License, or (at your option) any later version.
;;;;
;;;; This program is distributed in the hope that it will be
;;;; useful, but WITHOUT ANY WARRANTY; without even the implied
;;;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;;;; PURPOSE. See the GNU General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public
;;;; License along with this program; if not, write to the Free
;;;; Software Foundation, Inc., 59 Temple Place, Suite 330,
;;;; Boston, MA 02111-1307 USA
;;;;****************************************************************************
(require 'pjb-cl)
(defvar *saved-scroll-functions* nil)
(make-local-variable '*saved-scroll-functions*)
(defparameter *page-mode-bindings*
'((pm-backward-page scroll-down "<prior>" "C-c p p")
(pm-forward-page scroll-up "<next>" "C-c p n")
(pm-beginning-of-buffer beginning-of-buffer "<home>" "C-c p a" "C-c p <")
(pm-end-of-buffer end-of-buffer "<end>" "C-c p e" "C-c p >")))
(defun pjb-reset-page-mode-key-bindings ()
(loop for (new-fun old-fun . keys) in *page-mode-bindings*
do (loop for key in keys
do (local-set-key (kbd key) new-fun))))
(defun pjb-set-page-mode-key-bindings (&optional on)
(if (if on (plusp on) (not *saved-scroll-functions*))
(progn
(unless *saved-scroll-functions*
(setf *saved-scroll-functions*
(loop for (new-fun old-fun . keys) in *page-mode-bindings*
append (loop for key in keys
collect (list (kbd key) (key-binding (kbd key)))))))
(pjb-reset-page-mode-key-bindings)
(pjb-narrow-to-page))
(progn
(widen)
(beginning-of-buffer)
(if *saved-scroll-functions*
(progn
(mapc (lambda (args) (apply (function local-set-key) args))
*saved-scroll-functions*)
(setf *saved-scroll-functions* nil))
(loop for (new-fun old-fun . keys) in *page-mode-bindings*
do (loop for key in keys
do (local-set-key (kbd key) old-fun)))))))
(defun page-mode (&optional on)
(interactive "p")
(pjb-set-page-mode-key-bindings on)
(unless on
(let ((view view-mode))
(normal-mode t)
(when view (view-mode 1)))))
(defun pjb-narrow-to-page (&optional arg)
(interactive)
(narrow-to-page arg)
(let ((view view-mode))
(normal-mode t)
(when view (view-mode 1)))
(pjb-reset-page-mode-key-bindings))
(defun pm-forward-page (&optional count)
(interactive "p")
(setf count (or count 1))
(widen)
(unless (search-forward "\f" nil 'at-limit count)
(goto-char (point-max)))
(pjb-narrow-to-page))
(defun pm-backward-page (&optional count)
(interactive "p")
(setf count (or count 1))
(widen)
(unless (search-backward "\f" nil 'at-limit (1+ count))
(goto-char (point-min)))
(pjb-narrow-to-page))
(defun pm-beginning-of-buffer ()
(interactive)
(widen)
(goto-char (point-min))
(pjb-narrow-to-page))
(defun pm-end-of-buffer ()
(interactive)
(widen)
(goto-char (point-max))
(pjb-narrow-to-page))
(defun list-all-major-modes ()
"Well, all the major modes we can find.
We only include the symbols that are loaded.
"
;; There's no definite list, notably if you want potential major modes
;; that have not been loaded or installed yet. There's a
;; minor-mode-list but there is no major-mode-list.
(let ((major-modes '()))
(do-symbols (symbol)
(when (let ((name (symbol-name symbol)))
(and (< 5 (length name))
(string= "-mode" (subseq name (- (length name) 5)))
(not (member symbol minor-mode-list))
(fboundp symbol)
(not (macrop symbol))))
(push symbol major-modes)))
major-modes))
(defun pm-insert-page (new-major-mode)
"Inserts a new page at point."
(interactive (intern (completing-read "New mode: "
(sort (mapcar (function symbol-name)
(list-all-major-modes))
(function string<))
nil
:require-match
(cons (symbol-name major-mode)
0))))
(let ((new-page (format "%c\n" 12)))
(insert new-page "\n" new-page)
(backward-char 3)
(pjb-narrow-to-page)
(handler-case (funcall new-major-mode 1)
(error () (funcall new-major-mode)))
(insert (format "%s -*- mode:%s -*- %s\n\n"
(if (member new-major-mode
'(lisp-mode
emacs-lisp-mode))
";;"
comment-start)
new-major-mode
comment-end))))
(defun pjb-animate (speed)
(interactive "nSpeed: ")
(let ((delay (/ 1.0 speed))
(done nil))
(widen)
(goto-char (point-min))
(message "Animating...")
(while (not done)
(widen)
(if (search-forward "\f" nil 'at-limit)
nil
(goto-char (point-max))
(setq done t))
(narrow-to-page)
(sit-for delay)
(force-mode-line-update t))
(message "Done.")))
;;;; THE END ;;;;